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f911a4af JB |
1 | import fs from 'node:fs'; |
2 | ||
3 | import { type ChargingStation, ChargingStationUtils } from './internal'; | |
4 | import { FileType, IdTagDistribution } from '../types'; | |
5 | import { FileUtils, Utils, logger } from '../utils'; | |
6 | ||
7 | type IdTagsCacheValueType = { | |
8 | idTags: string[]; | |
9 | idTagsFileWatcher: fs.FSWatcher | undefined; | |
10 | }; | |
11 | ||
12 | export class IdTagsCache { | |
13 | private static instance: IdTagsCache | null = null; | |
14 | private readonly idTagsCaches: Map<string, IdTagsCacheValueType>; | |
15 | private readonly idTagsCachesAddressableIndexes: Map<string, number>; | |
16 | ||
17 | private constructor() { | |
18 | this.idTagsCaches = new Map<string, IdTagsCacheValueType>(); | |
19 | this.idTagsCachesAddressableIndexes = new Map<string, number>(); | |
20 | } | |
21 | ||
22 | public static getInstance(): IdTagsCache { | |
23 | if (IdTagsCache.instance === null) { | |
24 | IdTagsCache.instance = new IdTagsCache(); | |
25 | } | |
26 | return IdTagsCache.instance; | |
27 | } | |
28 | ||
29 | public getIdTag( | |
30 | distribution: IdTagDistribution, | |
31 | chargingStation: ChargingStation, | |
32 | connectorId: number | |
33 | ): string { | |
34 | const hashId = chargingStation.stationInfo.hashId; | |
e302df1d | 35 | const idTagsFile = ChargingStationUtils.getIdTagsFile(chargingStation.stationInfo); |
f911a4af JB |
36 | switch (distribution) { |
37 | case IdTagDistribution.RANDOM: | |
38 | return this.getRandomIdTag(hashId, idTagsFile); | |
39 | case IdTagDistribution.ROUND_ROBIN: | |
40 | return this.getRoundRobinIdTag(hashId, idTagsFile); | |
41 | case IdTagDistribution.CONNECTOR_AFFINITY: | |
42 | return this.getConnectorAffinityIdTag(chargingStation, connectorId); | |
43 | default: | |
44 | return this.getRoundRobinIdTag(hashId, idTagsFile); | |
45 | } | |
46 | } | |
47 | ||
48 | public getIdTags(file: string): string[] | undefined { | |
49 | if (this.hasIdTagsCache(file) === false) { | |
50 | this.setIdTagsCache(file, this.getIdTagsFromFile(file)); | |
51 | } | |
52 | return this.getIdTagsCache(file); | |
53 | } | |
54 | ||
55 | public deleteIdTags(file: string): boolean { | |
56 | return this.deleteIdTagsCache(file); | |
57 | } | |
58 | ||
59 | private getRandomIdTag(hashId: string, file: string): string { | |
60 | const idTags = this.getIdTags(file); | |
61 | const addressableKey = file + hashId; | |
62 | this.idTagsCachesAddressableIndexes.set( | |
63 | addressableKey, | |
64 | Math.floor(Utils.secureRandom() * idTags.length) | |
65 | ); | |
66 | return idTags[this.idTagsCachesAddressableIndexes.get(addressableKey)]; | |
67 | } | |
68 | ||
69 | private getRoundRobinIdTag(hashId: string, file: string): string { | |
70 | const idTags = this.getIdTags(file); | |
71 | const addressableKey = file + hashId; | |
72 | const idTagIndex = this.idTagsCachesAddressableIndexes.get(addressableKey) ?? 0; | |
73 | const idTag = idTags[idTagIndex]; | |
74 | this.idTagsCachesAddressableIndexes.set( | |
75 | addressableKey, | |
76 | idTagIndex === idTags.length - 1 ? 0 : idTagIndex + 1 | |
77 | ); | |
78 | return idTag; | |
79 | } | |
80 | ||
81 | private getConnectorAffinityIdTag(chargingStation: ChargingStation, connectorId: number): string { | |
e302df1d | 82 | const file = ChargingStationUtils.getIdTagsFile(chargingStation.stationInfo); |
f911a4af JB |
83 | const idTags = this.getIdTags(file); |
84 | const hashId = chargingStation.stationInfo.hashId; | |
85 | const addressableKey = file + hashId; | |
86 | this.idTagsCachesAddressableIndexes.set( | |
87 | addressableKey, | |
88 | (chargingStation.index - 1 + (connectorId - 1)) % idTags.length | |
89 | ); | |
90 | return idTags[this.idTagsCachesAddressableIndexes.get(addressableKey)]; | |
91 | } | |
92 | ||
93 | private hasIdTagsCache(file: string): boolean { | |
94 | return this.idTagsCaches.has(file); | |
95 | } | |
96 | ||
97 | private setIdTagsCache(file: string, idTags: string[]) { | |
98 | return this.idTagsCaches.set(file, { | |
99 | idTags, | |
100 | idTagsFileWatcher: FileUtils.watchJsonFile( | |
101 | file, | |
102 | FileType.Authorization, | |
103 | this.logPrefix(file), | |
104 | undefined, | |
105 | (event, filename) => { | |
106 | if (Utils.isNotEmptyString(filename) && event === 'change') { | |
107 | try { | |
108 | logger.debug( | |
109 | `${this.logPrefix(file)} ${FileType.Authorization} file have changed, reload` | |
110 | ); | |
111 | this.deleteIdTagsCache(file); | |
112 | this.deleteIdTagsCacheIndexes(file); | |
113 | } catch (error) { | |
114 | FileUtils.handleFileException( | |
115 | file, | |
116 | FileType.Authorization, | |
117 | error as NodeJS.ErrnoException, | |
118 | this.logPrefix(file), | |
119 | { | |
120 | throwError: false, | |
121 | } | |
122 | ); | |
123 | } | |
124 | } | |
125 | } | |
126 | ), | |
127 | }); | |
128 | } | |
129 | ||
130 | private getIdTagsCache(file: string): string[] | undefined { | |
131 | return this.idTagsCaches.get(file)?.idTags; | |
132 | } | |
133 | ||
134 | private deleteIdTagsCache(file: string): boolean { | |
135 | this.idTagsCaches.get(file)?.idTagsFileWatcher?.close(); | |
136 | return this.idTagsCaches.delete(file); | |
137 | } | |
138 | ||
139 | private deleteIdTagsCacheIndexes(file: string): void { | |
140 | for (const [key] of this.idTagsCachesAddressableIndexes) { | |
141 | if (key.startsWith(file)) { | |
142 | this.idTagsCachesAddressableIndexes.delete(key); | |
143 | } | |
144 | } | |
145 | } | |
146 | ||
147 | private getIdTagsFromFile(file: string): string[] { | |
148 | let idTags: string[] = []; | |
149 | if (file) { | |
150 | try { | |
151 | // Load id tags file | |
152 | idTags = JSON.parse(fs.readFileSync(file, 'utf8')) as string[]; | |
153 | } catch (error) { | |
154 | FileUtils.handleFileException( | |
155 | file, | |
156 | FileType.Authorization, | |
157 | error as NodeJS.ErrnoException, | |
158 | this.logPrefix(file) | |
159 | ); | |
160 | } | |
161 | } else { | |
162 | logger.info(`${this.logPrefix(file)} No id tags file given`); | |
163 | } | |
164 | return idTags; | |
165 | } | |
166 | ||
167 | private logPrefix = (file: string): string => { | |
168 | return Utils.logPrefix(` Id tags cache for id tags file '${file}' |`); | |
169 | }; | |
170 | } |